<style>
  .contact-card { width: 300px; border: 1px solid #aaa; padding: 1em; }
</style>

<article class="contact-card">
  <h3>
    <slot name="name">Unknown name</slot>
  </h3>

  <div>
    <slot name="address">Unknown address</slot>
  </div>
</article>
